v1.5.0

v1.5.0 (minor)

Changes since v1.4.0:

• Preserve letters outside the BMP in every case conversion (@Claude)
• Gate Dependabot auto-merge on CI actually being green (@Claude)
• ci: adopt the consolidated .NET workflow [patch] (@Claude)

What's Changed

• Bump the ktsu group with 9 updates by @dependabot[bot] in #69
• Preserve letters outside the BMP in every case conversion by @matt-edmondson in #71

Full Changelog: v1.4.7...v1.5.0